Base for annular lamp

ABSTRACT

A base for an annular lamp comprising a pair of semicylindrical members and base pins upstanding from one of these members. Each base pin is provided with an axial slit for holding therein an external lead of a glass bulb.

llnite Ti States atent Higuchi Mar. 5, 1974 BASE FOR ANNULAR LAMP [56]References Cited [75] Inventor: Noriyasu Higuclhi, Takatsuki, Japan UNED STATES PATENTS Assigneec Matsushita Electronics Corporation, Gilbert,Jl" Kadoma-shi, Osaka, Japan 7 Primary Examiner-James W. Lawrence Filedlp 1972 Assistant Examiner-Wm. H. Punter [21] APP] No: 290,582 AttorneyAgent, or Firm-Ladas, Parry, VonGehr Goldsmith & Deschamps Sept. 20,1971 Japan 46-86166 A base for an annular p Comprising a p of Semicylindrical members and base pins upstanding from 2% 8 g k one of thesemembers. Eachbase pin is provided with E 5 i 4 7 an axial slit forholding therein an external lead of a glass bulb.

2 Claims, 3 Drawing Figures BASE FOR ANNULAR LAMP This invention relatesto improvements in the structure of bases for annular lamps.

The structure of prior art bases for annular lamps has been such thatleads are passed through hollow metal pins erected on the base and areled outwardly to be connected at their external portion to the hollowmetal pins by means such as soldering or electric welding. Because ofsuch a structure, very troublesome work has been required for mountingthe base on the glass bulb and this has been a hindrance to improvementsin the efficiency of assembling the annular lamp.

With a view to obviate the prior art defect above described, it is aprimary object of the present invention to eliminate the step ofconnection between hollow metal pins and leads by soldering, electricwelding or like means in the prior art bases for annular lamps and toprovide an improved base for an annular lamp which can be assembled byremarkably simplified steps.

The above and other objects, features and advantages of the presentinvention will be apparent from the following description of a preferredembodiment thereof taken in conjunction with the accompanying drawing,in which:

FIG. I is a perspective view of one of a pair of semicylindrical membersconstituting a base for an annular lamp embodying the present invention;

FIG. 2 is a sectional view of the base in the state in which it ismounted on an annular lamp; and

FIG. 3 is a section taken on the line II II in FIG. 3.

Referring to FIG. 1, a metal ring 2 is provided at each end of a glassbulb 1 of an annular lamp. A base according to the present inventionincludes a pair of first semicylindrical member 3 and a secondsemicylindrical member 7 of material such as synthetic resin.

Four metal rods 4 of material such as brass or nickelplated brass arefixed at one end of the inner wall of the first semicylindrical member 3although only two of them are shown in FIG. 1. The metal rods 4 arecircular in cross section and extend externally to the lamp to beinserted at the other end thereof in a socket (not shown) for the supplyof current to the lamp therethrough. An axial slit 5 extends from thetop to a portion adjacent to the lower end of each metal rod 4 as seenin FIG. 1. External leads 6 are connected electrically to filament coils(not shown) and are held at the end portion thereof in the respectiveslits 5 of the metal rods 4. Referring to FIGS. 2 and 3, the secondsemicylindrical member 7 is provided at its upper portion with fourspaced perforations 8 whose diameter is substantially equal to the outerdiameter of the metal rods 4. Therefore, when the first semicylindricalmember 3 is assembled with the second semicylindrical member 7 at thegap between the opposite ends of the bulb l, the four metal rods 4upstanding from the inner wall of the first semicylindrical member 3 fitin and extend through the four perforations 8 respectively of the secondsemicylindrical member 7 and these perforations 8 act to apply fasteningpressure to the metal rods 4 provided with the slits 5. The first andsecond semicylindrical members 3 and 7 may then be secured to each otheras by screws.

With such a structure, the base comprising the first and secondsemicylindrical members 3 and 7 and the metal rods 4 is mounted on theglass bulb l in the manner described below. At first, the leads 6 arefitted in the respective slits 5 of the metal rods 4 upstanding from theinner wall of the first semicylindrical member 3, and then the secondsemicylindrical member 7 is mounted on the first semicylindrical member3 while allowing the free ends of the metal rods 4 on the firstsemicylindrical member 3 to extend through the perfo rations 8 of thesecond semicylindrical member 7. When the base is mounted on the glassbulb l in this manner, the leads 6 fitted in the slits 5 of the metalrods 4 are fastened by the fastening force of the metal rods 4 due tothe resiliency thereof, and the slits 5 of the metal rods 4 are narrowedby the fastening effect of the perforations 8 of the secondsemicylindrical member 7 to prevent escapement of the leads 6 from theslits 5 of the metal rods 4.

One may consider that the base according to the present invention mayinclude a problem of ma]- contact since the electrical contact betweenthe leads 6 and the metal rods 4 is attained merely by fitting the leads6 in the slits 5 of the metal rods 4. By making the space of the slits 5slightly smaller in width than the diameter of the leads 6, said leads 6are suitably supported in said slits 5 by means of the resiliency of themetal rods 4. However, the perforations 8 in the second semicylindricalmember 7 may make smaller in diameter than the outer diameter of themetal rods 4 so as to impart the fastening pressure to the metal rod 4after assembling of the base, so that the leads 6 are secured to themetal rods 4 since the space of the slits are narrowed. The inventormanufactured many bases according to the present invention and mountedthese bases on glass bulbs to complete annular lamps. The results of alife test carried on the annular lamps proved that the lamps areentirely free from any mal-contact.

It will be understood from the foregoing description that the presentinvention can remarkably simplify the assembling of annular lamps due tothe fact that no connection step between the leads and the metal pins asby soldering or electric welding as in the prior art process is requiredafter the assembling of the first and second cylindrical members.

Further, due to the fact that the metal rods projecting outwardly fromthe base are provided with the slits, the metal rods can be easilyinserted into a socket by the resiliency and a good electrical contactcan also be ensured.

What is claimed is:

l. A split base for an annular lamp bulb comprising a firstsemicylindrical member and a second semicylindrical member adapted tohold the opposite ends of an annular bulb by bridging across the gapbetween such ends, and a plurality of metal rods fixed at one endthereof to the inner wall of said first semicylindrical member, saidmetal rods being adapted to be received through perforations formed inthe side wall of said second semicylindrical member, and each said metalrod being provided with an axial slit for holding therein an externallead of said bulb.

2. A base as claimed in claim 1, wherein the perforations formed in theside wall of the second semicylindrical member are sized so as to impartfastening force to the metal rod thereby narrowing said slits.

1. A split base for an annular lamp bulb comprising a firstsemicylindrical member and a second semicylindrical member adapted tohold the opposite ends of an annular bulb by bridging across the gapbetween such ends, and a plurality of metal rods fixed at one endthereof to the inner wall of said first semicylindrical member, saidmetal rods being adapted to be received through perforations formed inthe side wall of said second semicylindrical member, and each said metalrod being provided with an axial slit for holding therein an externallead of said bulb.
 2. A base as claimed in claim 1, wherein theperforations formed in the side wall of the second semicylindricalmember are sized so as to impart fastening force to the metal rodthereby narrowing said slits.